JPH0232706A - Gas insulated power receiving transformer board - Google Patents

Abstract

PURPOSE:To reduce the installation area of power receiving facility and to improve the reliability of gas seal by fixing a switchgear and a current transformer connected with the primary side of a power receiving transformer to the back of the front wall of the power receiving transformer contained in a box filled with insulating gas. CONSTITUTION:At the front section of an air-tight box 9 (As shown in the side cross-sectional view of a gas insulated power receiving transformer board 14), a partition 9a is provided to the ceiling board 9d across the overall width of the box 9, and a power receiving transformer 2 is contained at the rear section. A case 9b which is projecting when viewed from the sideface is fixed air-tightly from the front face to the front wall of the power receiving transformer 2, and a switchgear, i.e., a vacuum circuitbreaker, comprising an upper primary-side terminal 3a, an intermediate switching section 3b, a lower secondary-side terminal 3c and an operational mechanism 3d is fixed to the rear face of the case 9b. One end of a cooler fixed to the upper face of the ceiling board 9d is coupled with an exhaust port 13A and the other end of the cooler 12 is coupled with a suction port 13B arranged at the front section of the ceiling board 9d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a gas-insulated power receiving transformer board in which a power receiving transformer is housed in a box filled with insulating gas.

(Prior art) In Fig. 4, which shows an example of a conventional two-line power reception system,
Disconnectors 2 each connected to a separate power supply system (not shown)
A disconnector 23 is connected to the load side of the circuit breaker 22 via a circuit breaker 22, and the load sides of the disconnectors 23 are connected to each other and branched into two lines via a transaction transformer (hereinafter referred to as PCT) 1. It is connected via a switch 3 such as a vacuum circuit breaker or a moon-shaped switch and a current transformer 4 to a power receiving transformer 2 filled with sulfur hexafluoride gas (hereinafter referred to as insulating gas).

Depending on the power receiving equipment, for example, as shown in Figure 5,
A cable junction box 6 is attached to the upper side of a transformer panel 2 that is connected to a PCT panel 1a containing a PCTl, and a switch 3 and a current transformer 4 are housed in the cable junction box 6.

In addition, when the installed capacity increases, the switch 3 and current transformer 4 are connected to the transformer adjacent to the PCT panel 1a - the next panel 8 as shown in Fig. 6.
A and 8B, and connect the cable 5 to the power receiving transformer via the cable connection box 6! Some are connected to H2A and 2B.

(Problem to be Solved by the Invention) However, in the power receiving equipment having such a configuration, the power receiving transformer panels 2A, 2B and the switch panel 8A housing the switch 3, etc.
, 8B has been made smaller by filling with insulating gas and separated into gases to facilitate maintenance and inspection, but the number of boxes does not decrease, so the installation floor space does not decrease even though the volume is reduced.

Additionally, the reliability of the gas seal is reduced due to the large number of gas compartments.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a gas insulated transformer panel for power reception which can further reduce the installation floor area and improve the reliability of the gas seal.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a gas-insulated power-receiving transformer board in which a power-receiving transformer is housed in a sealed box, which is connected to the power source side of the power-receiving transformer. This is a gas insulated transformer panel for power receiving, which reduces the installation area of the power receiving equipment and improves the reliability of the gas seal by attaching the switch to the inside of the front wall of the box.

An example will be explained with reference to FIG.

FIG. 1 is a side cross-sectional view of the power receiving gas insulated transformer panel 14 of the present invention. At the front part (left side in the figure) of the airtight box body 9, there is a ceiling plate 9d that spans the entire width of the box body 9. A partition 9a is provided, and the power receiving transformer 2 is housed at the rear of the partition 9a.

Further, a case 9b having a convex shape when viewed from the side is airtightly attached to the front wall of the power receiving transformer 2 from the front.
The living surface of this case 9b includes an upper primary side terminal 3a, an intermediate opening/closing part 3b, a lower secondary side terminal 3C, and an operating mechanism 3d.
A vacuum circuit breaker as a switch 3 is installed.

In addition, in front of the upper end of the power receiving transformer 2, a busbar 7 connected to a connection bushing (not shown) airtightly attached to the side plate of the box 9 airtightly moves the box 9 from side to side (direction perpendicular to the page). A conductor 10 extending downward from the bus bar 7 is connected to the rear end of the primary terminal 3a.

Two through-type current transformers 4 are attached to the lower side of the secondary side terminal 3C, and the conductor 11, one end of which is connected to the rear end of the secondary side terminal 3C, is connected to the through-type current transformer 4. A primary side terminal 2 is provided on the front side of the power receiving transformer 2 by penetrating it and bending upward at the rear.
A secondary conductor (not shown) of the power receiving transformer 2 is connected to a cable bit (not shown) provided on the floor from the connection box 9C on the back surface of the box 9.

Also, on the ceiling plate 9d of the box body 9, there is an exhaust port 13A at the rear for discharging the insulating gas heated by the power receiving transformer 2 upward! f
One end of a cooler 12 attached to the upper surface of the ceiling plate 9d is connected to the exhaust port 13A, and the other end of the cooler 12 is connected to the air intake port 1 provided at the front of the ceiling plate 9d.
Connected to 3B.

According to the power receiving gas insulated transformer panel 14 having such a configuration, the two-line power receiving equipment shown in the single line diagram in FIG. By arranging the power receiving gas insulated transformer panel 14 adjacent to the right side of the PCT panel on the right side of the panel 15, the installation floor area of the power receiving equipment can be reduced.

Furthermore, since the conventional cable junction box 6 is no longer required, the number of gas compartments is reduced and the reliability of the gas seal can be improved.

In the above embodiment, the switch 3 is a vacuum circuit breaker, and the partition 9a is provided only at the upper part. However, if the inside of the box 9 is completely partitioned from front to back by partition walls 9e as shown in FIG. Energize the power receiving transformer 2 with a square switch! (a) It may be used for current interruption, and the connection between the power receiving transformer 2 and the conductor 11 may be made by a bushing 16 provided on the partition wall 9e. In this case, the intake port 13B for the cooler 12 only needs to cool the rear side of the partition wall 9e, which is closer to the transformer where the temperature is higher (
Note: Due to the temperature in the switchgear room, the height is low).

In this case, even if the insulating gas deteriorates due to the generation of arcs due to opening and closing, it will not affect the power receiving transformer 2, so there is an advantage that the selection of the insulating material for the transformer etc. becomes easier.

Furthermore, the connection between the switch 3 and the conductor 10.11 may be made in a clip-in type so that it can be attached and detached from the front side together with the case 9b. This has the advantage that maintenance and inspection of the switch 3 becomes easier.

[Effects of the Invention] As described above, according to the gas-insulated power-receiving transformer panel housing the power-receiving transformer of the present invention, the erosion surface of the front wall of the power-receiving transformer housed in the box filled with insulating gas A switch and current transformer connected to the primary side of this power receiving transformer are installed in the power receiving transformer, which reduces the installation area of the power receiving equipment and increases the reliability of the gas seal. You can get the board.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of a power receiving gas insulated transformer panel housing the power receiving transformer of the present invention, and Fig. 2 is an explanation showing the arrangement of the power receiving gas insulated transformer panel of the present invention. 3 is a side sectional view showing another embodiment of the power receiving gas insulated transformer panel of the present invention, FIG. 4 is a single line diagram showing this type of two-line power receiving equipment, and FIGS. 5 and 6. 1 is a diagram showing the configuration and arrangement of a gas-insulated power receiving transformer panel housing a conventional power receiving transformer. 2... Power receiving transformer, 3... Switch 7... Bus bar, 9... Box 9a... Partition,
9b...Case (8733) Agent Patent Attorney Yoshiaki Inomata (1 idiot) Figure Figure

Claims (1)

[Scope of Claims] In a power receiving gas insulated transformer board in which a power receiving transformer connected to the load side of a switch is housed in a box filled with insulating gas, the switch is placed in front of the box. A gas insulated transformer panel for power reception that is housed inside the wall.